Airworthiness Directive · Amendment 39-17026 · Wings
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes, certificated in any category, as identified in Boeing Service Bulletin 777-57A0087, Revision 1, dated August 24, 2011.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes. This AD was prompted by reports of cracks found in the Web pockets of the wing center section (WCS) spanwise beams. This AD requires repetitive detailed inspections and high frequency eddy current inspections for cracks of the WCS spanwise beams, and repair if necessary. We are issuing this AD to detect and correct cracking in the WCS spanwise beams, which could result in reduced structural integrity of the wings.
At the later of the times specified in paragraphs (g)(1) and (g)(2) of this AD, do a detailed inspection and a high frequency eddy current inspection for cracks of the web pockets of the WCS spanwise beams numbers 1, 2, and 3; and a detailed inspection for cracks of any previously installed repairs; in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-57A0087, Revision 1, dated August 24, 2011. Repeat the inspections thereafter at intervals not to exceed 8,000 flight cycles.
(1) Before the accumulation of 8,000 total flight cycles.
(2) Within 6,000 flight cycles, or 1,125 days, after the effective date of this AD, whichever occurs first.
If any cracking is found during any inspection required by paragraph (g) of this AD, before further flight, repair the crack, including related investigative actions and all applicable corrective actions, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-57A0087, Revision 1, dated August 24, 2011; except where Boeing Service Bulletin 777-57A0087, Revision 1, dated August 24, 2011, specifies to contact Boeing for repair instructions, before further flight, repair the cracking using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
This paragraph provides credit for actions required by paragraphs (g) and (h) of this AD if those actions were performed before the effective date of this AD using Boeing Alert Service Bulletin 777-57A0087, dated November 11, 2010.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
